🎨 Color Converter
Convert between HEX, RGB, HSL, and CSS formats. See contrast ratios, shades, and tints instantly.
RGB
HSL
All Formats
#6366F1rgb(99, 102, 241)rgba(99, 102, 241, 1)hsl(239, 84%, 67%)--color: #6366f1;[#6366f1]Shades & Tints
Accessibility Contrast Ratios (WCAG)
White text on your color
4.47:1
Black text on your color
4.70:1
Color Converter -- Complete USA Guide 2026
The Color Converter is the web developer's essential tool for instantly converting colors between HEX, RGB, HSL, and CSS formats. Whether you're building a website, designing a UI, or writing CSS, accurate color conversion is a daily need for front-end developers, UI/UX designers, and digital artists across the United States and worldwide.
Our free online Color Converter runs entirely in your browser with zero data transmission. Simply pick a color using the visual color picker, enter a HEX code like #3b82f6, or adjust RGB/HSL sliders - all three formats update in real time simultaneously. Copy any format with one click, generate complete shade and tint palettes, and check WCAG accessibility contrast ratios instantly.
American developers working on ADA-compliant websites need WCAG 2.1 AA contrast ratios (minimum 4.5:1 for normal text). This tool shows your exact contrast ratio against white and black backgrounds, with immediate pass/fail indicators for both AA and AAA standards - saving you from expensive accessibility audits later.
🔬 How This Calculator Works
The Color Converter implements the standard color space transformation algorithms used in CSS and digital design. HEX is simply RGB expressed in base-16 notation: #RRGGBB where each pair is 0-255 in hexadecimal. RGB (Red, Green, Blue) is the additive color model used by all screens. HSL (Hue, Saturation, Lightness) is a more intuitive model for human perception of color.
Conversion from RGB to HSL uses the standard formula: Lightness = (max+min)/2, Saturation depends on lightness range, and Hue is derived from which color channel is dominant. The WCAG contrast ratio uses relative luminance calculated with the sRGB color space formula specified in WCAG 2.1 guidelines by the W3C Web Accessibility Initiative.
All conversions happen in real time - changing any input instantly updates all other formats. The shade generator creates 9 variants of your color by holding Hue and Saturation constant while sweeping Lightness from 10% to 90%, following the same approach used by popular design systems like Tailwind CSS.
✅ What You Can Calculate
Real-Time Multi-Format Conversion
Change any input (HEX, RGB sliders, or HSL sliders) and all other formats update instantly. No button clicking, no page reload - live conversion as you design.
WCAG Accessibility Contrast Checker
Instantly see contrast ratios against white and black backgrounds with AA/AAA pass/fail indicators. Essential for ADA-compliant US web development.
Automatic Shade & Tint Generation
Generate a complete 9-step color palette from your base color - identical to how Tailwind CSS and Material Design generate their color scales.
All CSS Formats Ready to Copy
One-click copy for HEX, RGB, RGBA, HSL, CSS custom property, and Tailwind arbitrary value formats. Works directly in your stylesheet.
Visual Color Picker Integration
Use the native browser color picker for visual selection, then get all formats instantly. No switching between apps or browser developer tools.
Zero Install, Zero Account
Works in any browser on any device. No extension to install, no account to create. Bookmark and use whenever you are writing CSS.
🎯 Real Scenarios & Use Cases
Front-End Web Developers
Convert brand colors from design files (usually HEX) to CSS custom properties, RGBA with opacity, or HSL for dynamic theming in CSS variables.
UI/UX Designers
Generate complete color scales from a single brand color, check accessibility compliance, and hand off exact color values to development teams.
WordPress & Shopify Theme Developers
CMS theme builders routinely need to convert between color formats when customizing templates that use different color notations in their CSS.
Accessibility Specialists
Verify WCAG contrast compliance for client websites. The built-in contrast checker eliminates the need for separate tools during accessibility audits.
Graphic Designers Moving to Web
Print designers use CMYK; web uses RGB. This tool helps designers transitioning to digital understand web color formats and convert their palette.
Students Learning CSS
Visual, interactive demonstration of how HEX, RGB, and HSL relate to each other makes color theory concrete and immediately applicable.
💡 Pro Tips for Accurate Results
When working with brand colors, always store your primary palette as CSS custom properties (CSS variables) using HSL notation - it makes generating tints and shades trivially easy in CSS: hsl(var(--hue), var(--saturation), 90%) for a light tint.
For dark mode implementation, HSL is far superior to HEX or RGB because you can flip lightness values programmatically: a color at L=30% in dark mode corresponds to L=70% in light mode, making theme switching a simple CSS variable change.
For WCAG AA compliance (required for most US government and enterprise websites), you need at least 4.5:1 contrast for normal text and 3:1 for large text (18pt+). If your brand color fails both white and black text contrast, consider using a tinted white background or a darkened brand color for text rather than the pure brand color.
Always check colors on actual device screens before finalizing - monitors, phones, and screens have different gamma curves and gamut rendering. What looks correct on one device may appear differently on another, especially at extreme light or dark values.
🔢 Data Sources & Methodology
Color science and digital color representation have a rich technical foundation. The sRGB (standard Red Green Blue) color space, defined by HP and Microsoft in 1996 and standardized as IEC 61966-2-1, became the default color space for web browsers and the internet. CSS Color Level 4 (2023) extends CSS to support Display P3 (wider gamut, used by Apple devices), OKLCH (perceptually uniform), and other modern color spaces beyond sRGB.
The WCAG (Web Content Accessibility Guidelines) contrast ratio formula was developed by the W3C Web Accessibility Initiative based on research into human visual perception. The formula uses relative luminance in the sRGB color space to approximate how the human eye perceives contrast. Importantly, perceived luminance is not linear - the formula applies gamma correction (the sRGB transfer function) to account for how display hardware maps digital values to light output.
CSS Color Level 5 introduces color-mix() and relative color syntax that allow dynamic color manipulation - mixing colors, lightening/darkening by percentage - directly in CSS without JavaScript. This makes the color scale generation demonstrated in this tool reproducible in pure CSS for modern browsers.
🏁 Bottom Line
The Color Converter is the all-in-one color tool every web developer, designer, and digital creator needs bookmarked. Convert between all CSS color formats, generate accessibility-compliant color palettes, and check WCAG contrast ratios - all in one free, browser-based tool.
Pair it with our CSS Gradient Generator and Color Contrast tools for a complete front-end color workflow. No installs, no sign-ups, no limits - professional color conversion available to any American developer right in their browser.
When should I use HEX vs RGB vs HSL in CSS?
HEX (#3b82f6) is the most compact and universally supported — use it when copying colors from design tools like Figma or matching existing codebase conventions. RGB (rgb(59, 130, 246)) is readable and explicit for when you need to see individual channel values. HSL (hsl(217, 91%, 60%)) is the most intuitive for humans — hue (0-360° color wheel position), saturation (0-100% vividness), lightness (0-100% brightness). HSL is best when programmatically adjusting colors: darkening = reduce lightness, creating tints = increase lightness. For design systems with light/dark mode variants, HSL is strongly preferred.
Why does the same color look different on screen vs in print?
Screens use RGB (additive color model — combining light). Print uses CMYK (subtractive — ink). The gamut (range of reproducible colors) differs: screens can display vivid blues and greens that CMYK inks cannot accurately reproduce. When a design looks bright blue on screen but prints duller, this is the gamut mismatch. CMYK values this converter produces are approximate for reference — professional print work requires color-managed workflows with ICC profiles.
How do I create a color palette from a single hex value using HSL?
Convert your base color to HSL. Keep the hue (H) constant and vary saturation (S) and lightness (L). For a typical design system: 95% lightness = lightest tint, 90% = very light, 80% = light, 60% = medium light, original = base, 40% = medium dark, 20% = dark, 10% = darkest. For example, hsl(217, 91%, 60%) would have a light variant at hsl(217, 91%, 90%). The Color Palette Generator on this site automates this and produces a complete 9-step scale.
What is the alpha channel and how do I add transparency?
The alpha channel controls opacity (0 = fully transparent, 1 = fully opaque). In CSS: rgba(59, 130, 246, 0.5) for 50% transparent, or 8-digit hex #3b82f680 where the last two hex digits are alpha (80 hex = 128 decimal ≈ 50% opacity). HSL supports hsla(). Modern CSS accepts 8-digit hex natively. For overlay effects: use 0.04-0.08 for very subtle overlays, 0.6-0.8 for semi-transparent modals.
How do I convert a color from Figma or Photoshop to CSS?
Figma: click the color value in the inspector to switch formats (HEX/RGB/HSL), then copy. The HEX copies in CSS-ready format (#3b82f6). Photoshop: shows RGB 0-255 values in the Color Picker — paste those into this converter to get HEX or HSL. If the design uses a P3 wide-color space, standard CSS HEX and RGB assume sRGB — the Color Level 4 spec adds color(display-p3 ...) syntax but support is still limited.
What is the difference between HSV and HSL?
Both use Hue, but differ in the third dimension. HSL: pure white is L=100% regardless of saturation; a fully saturated pure red is at L=50%. HSV: pure white is S=0, V=100%; fully saturated pure red is S=100%, V=100%. HSV is more natural for color pickers (most digital pickers use HSV internally — moving to the top-right always gives the most vibrant hue). HSL is more useful for CSS because 'make this 20% lighter' maps intuitively to increasing L.
What color tools work alongside the converter?
The Color Contrast Checker verifies WCAG accessibility requirements for text/background pairs using your converted colors. The Color Palette Generator creates a full design-system scale from your converted color. The CSS Gradient Generator uses HEX and RGB inputs to build gradient backgrounds. The Box Shadow Generator accepts color inputs for shadow tinting. All are in the Dev Tools CSS section.